Fifteen years after the tragedy at Columbine High School in Littleton, Colo., a look at other deadly shootings at U.S. schools and college campuses.

1999

2001

2003

2005

2007

2009

2011

2013

2015

April 20, 1999

H. Darr Beiser, USA TODAY

Columbine High School

Students Eric Harris, 18, and Dylan Klebold, 17, open fire at Columbine High School in Littleton, Colo. They kill 12 students and one teacher and wound more than 20 others before killing themselves in the school's library.

Nov. 19, 1999

The Deming (N.M.) Headlight via AP

Deming Middle School

Victor Cordova Jr., 12, shoots and kills 13-year-old classmate Araceli Tena, pictured, at the Deming, N.M., school. He later pleads guilty and is sentenced to two years in juvenile prison.

Feb. 29, 2000

Charles V. Tines, AP

Theo J. Buell Elementary School

A 6-year-old boy shoots and
kills classmate Kayla Rolland, also 6, at a school in Mount Morris Township,
Mich. The boy is not charged because of his age.

However, Jamelle James, 19 at the time, who was living with the boy, is sentenced to two to 15 years in prison for storing the gun where the boy could easily access it. The boy's uncle, who owned the house they were living in, pleads guilty to possessing the stolen gun used in the
shooting.

May 26, 2000

Miami Herald via AP

Lake Worth Community Middle School

Honor student Nathaniel Brazill, 13, shoots and kills his teacher Barry Grunow on the last day of classes
in Lake Worth, Fla. He is sentenced to 28 years in prison.

March 5, 2001

Sandy Huffaker

Santana High School

Charles "Andy" Williams, 15, opens fire inside the Santee, Calif., high school, killing two students and injuring 13 others. He is later sentenced to 50 years to life in prison.

Sept. 24, 2003

Richard Sennott, (Minneapolis) Star Tribune, via AP

Rocori High School

John Jason McLaughlin, a 15-year-old freshman at the Cold Spring, Minn., high school, shoots and kills classmates Aaron Rollins, 17, and Seth Bartell, 15. McLaughlin is convicted of murder and sentenced to life in prison.

March 21, 2005

AP

Red Lake Senior High School

Sixteen-year-old Jeff Weise kills his grandfather and a companion of his grandfather's, then heads to a high school on the Red Lake Indian Reservation in Minnesota. He kills five students, a teacher and a security guard before taking his own life.

Nov. 8, 2005

Michael Patrick, (Knoxville, Tenn.) News Sentinel

Campbell County Comprehensive High School

Kenneth Bartley, 15, shoots and kills assistant principal Ken Bruce and wounds two other administrators at a Jacksboro, Tenn., school. Bartley was found guilty of the reduced charge of reckless homicide in February 2014, according to WBIR-TV, and acquitted of first-degree murder.

Aug. 30, 2006

Orange High School

Former student Alvaro Castillo, 19, is arrested after murdering his father and then opening fire in the Hillsborough, N.C., school's parking lot, wounding two. He is allegedly obsessed with the Columbine shootings, and police find two pipe bombs and two rifles in the van he was driving. He later is found guilty of murder and other charges and sentenced to life without parole.

Before the shootings, Castillo sends an e-mail to the principal of Columbine High School, according to the Associated Press, that reads: "Dear Principal, in a few hours you will probably hear about a school shooting in North Carolina. I am responsible for it. I remember Columbine. It is time the world remembered it. I am sorry. Goodbye."

Sept. 27, 2006

Barry Gutierrez, The Rocky Mountain News

Platte Canyon High School

Adult gunman Duane R. Morrison takes six girls hostage at the Bailey, Colo., high school and fatally shoots one of them,16-year-old Emily Keyes. Morrison then kills himself.

Sept. 29, 2006

Morry Gash, AP

Weston High School

Eric Hainstock, 15, shoots and kills John Klang, 49, the Cazenovia, Wis., school's principal. Klang had issued Hainstock a warning the day before for having tobacco at school.

Oct. 2, 2006

Matt Rourke, AP

West Nickel Mines Amish School

Milk-truck driver Charles C. Roberts, 32, enters a one-room Amish schoolhouse in Nickel Mines, Pa., and isolates the female students in the classroom before methodically executing them. He kills five girls and wounds several more. Roberts then commits suicide.

April 16, 2007

Virginia State Police via AP

Virginia Tech

Gunman Seung-Hui Cho, 23, kills two people in a dormitory on the Blacksburg, Va., campus. A few hours later, Cho enters an academic building and kills 30 more people and himself. It remains the deadliest U.S. shooting to date.

Feb. 14, 2008

Nam Y. Huh, AP

Northern Illinois University

Shooter Steven Kazmierczak, 27, enters a lecture hall on the university campus in DeKalb, Ill., and kills five students and wounds 18 others before taking his own life.

Oct. 26, 2008

Danny Johnston, AP

University of Central Arkansas

Two students, Ryan Henderson, 18, and Chavares Block, 19, are killed in a shooting carried out by four men at the Conway, Ark., campus.

Feb. 27, 2012

AP

Chardon High School

Three students are killed after T.J. Lane, 17, opens fire inside the cafeteria of the Chardon, Ohio, school.

Dec. 14, 2012

Frank Becerra, The Journal News

Sandy Hook Elementary School

Adam Lanza, 20, shoots and kills his mother, Nancy, in their home before driving to Sandy Hook Elementary in Newtown, Conn. He kills 26 people at the school, 20 of whom are first-graders, before shooting and killing himself.

June 7, 2013

Robert Gauthier, The Los Angeles Times, via AP

Santa Monica College

Gunman John Zawahri, 23, kills his father and brother and sets their home on fire before going to the college campus in Santa Monica, Calif.. There, he randomly shoots at cars, killing three more and wounding others before he is killed by police.

Oct 21, 2013

Marilyn Newton, Reno Gazette-Journal

Sparks Middle School

Jose Reyes, a middle school student, shot and killed a teacher and injured two students in Sparks, Nev., before taking his own life.

Dec. 13, 2013

Ed Andrieski, AP

Arapahoe High School

Karl Pierson, 18, shoots student Claire Davis, 17, in the head at point-blank range in their school in Littleton, Colo. Pierson then kills himself. Davis is hospitalized and dies eight days later. The incident occurred in the same town where the 1999 Columbine school shooting took place.

June 5, 2014

AP Photo/Ted S. Warren

Seattle Pacific University

Aaron R. Ybarra, 26, is taken into custody after a shooting on the campus of Seattle Pacific University that leaves one man in his 20s dead and three others injured. The call to 911 comes in at 3:23 p.m. from Otto Miller Hall, after the shooter is pepper-sprayed and pinned down by a student guard.

Jun 10, 2014

Faith Cathcart, AP, The Oregonian

Reynolds High School

A teen killed another student, Emilio Hoffman, and wounded a teacher at an Oregon high school.

Oct. 24, 2014

Marysville Pilchuck High School

Two people, including a gunman who opened fire on fellow students, are dead at a high school north of Seattle.

Nov. 20, 2014

AP/Mark Wallheiser

Florida State University

A least three people are injured after being shot at the Florida State University library before campus police shoot and kill the gunman, according to Tallahassee police.